Read VBA macros (or vbaProject.bin) of an Excel file without opening it in MS Excel

There is a very large PDF from Microsoft which documents how to extract functions from the vbaproject.bin:

https://interoperability.blob.core.windows.net/files/MS-OVBA/%5bMS-OVBA%5d.pdf [Source]

This resource is current & available as of June 27, 2019. The event that this link goes stale (Microsoft periodically changes their permalink structure or otherwise alters how they implement their documentation/answer repositories, etc.), search for MS-OVBA.pdf.

Some additional information which may or may not be complimentary to the above:

http://www.codeproject.com/Articles/15216/Office-2007-bin-file-format

Here's an article updated in 2017 that lists several tools for helping with this. I was able to extract the VBA code out of a vbaProject.bin using the OfficeMalScanner tool. Edit: some months after successfully using this tool, Windows is detecting malware in it. The link was www dot reconstructer dot org / code / OfficeMalScanner.zip. Use at your own risk - it worked for me to extract a bunch of needed VBA code from the project after the source was lost.